Freon Free Carbon Dioxide Ejector Refrigeration Cycle Using Suction Force by Two-phase Expansion Waves

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A long term solution for global warming is now inevitable to mitigate the dilemma of climate change. Two of the most effective solutions are to increase the efficiency of a system or device and to use natural working fluids. An ejector can improve the performance of a CO2 refrigeration system by recovering the energy lost during expansion. The theoretical studies for two-phase expansion wave at the outlet of the driving nozzle are carried out. It is shown that the disk shock wave appears just after the expansion waves. The experiments which elucidate the effect of the length and the flow area of the mixing section are also carried.